Draft regulator for chimneys



y 1942- R. J. DEVER EI'AL 2,281,925

DRAFT REGULATOR FOR CHIMNEYS Filed May 14, 1940 Z SheetS -Sheet 1 @110 i v 7 1' 2.

F I! 22 I H h 77 I i I a? aw 48 4 f I i l i I 1 H flffievei J elfiez'efi INVENTORSLI ATTORNEYS.

y 1942- 1%. J. DEVER ET AL 2 2,281,925

Filed May 14, 1940 g sheets-sheet 2 i Jfiez'ei I. Jflez/efl V v JNVENTOR-S.

A TTORNEYS.

Patented May 5, 1942 UNiTED STATES DRAFT REGULATOR FOR. CHIMNEYS Roger J. Dever and Patrick J. Dever, Freeland, Pa.

2 Claims.

This invention relates to draft control devices, designed for use in connection with stove pipes or chimneys of heating plants, cooking stoves or the like, the primary object of the invention being to provide means whereby the draft through the fire-box of the furnace or stove, may be regulated and controlled, to insure the efficiency of the heating plant.

An important object of the invention is to provide a draft control device which will not in any way obstruct the ordinary draft through the Stovepipe or chimney, and one which may be readily thrown into operation to accomplish its purpose.

Another object of the invention is to provide a device of this character which may be readily installed without the necessity of making extensive alterations in the Stovepipe or chimney construction.

Still another object of the invention is to provide a draft control device wherein the motor shaft which supports the blower, is jacketed and air-cooled, preventing the intense heat of the products of combustion passing through the chimney or smoke-stack, being transmitted to the motor shaft, to impair the efficiency of the motor. I

With the foregoing and other obJects in view, which will appear as the description proceeds,

the invention resides in the combination and arrangement of parts and in the detailsof con: struction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein described, may

be made within the scope of what is claimed,

without departing from the spirit of the invention.

Referring to the drawings: I

Figure 1 is a side elevational View of a form of the invention.

Figure 2 is a sectional view through the device as shown by Figure l.

Figure 3 is a longitudinal sectional View through the device.

Figure 4 is a sectional view taken on line l4 of Figure 3.

Figure 5 is a sectional view taken on line 55 of Figure 4.

ates. The blower housing 23 also includes a sub- 55 stantially straight wall 26 which directs the blast of air inwardly to the smoke-pipe. Because the blower is subjected to the direct heat of the products of combustion passing through the smoke-pipe 22, the blower and blower shaft are of a particular construction to insure the blower shaft being maintained cool. The hollow motor shaft indicated at 21, provides a support for the tubular shaft 28. The ends of the tubular blower shaft 28, are closed by means of the end members 29, which are shown as extended into the ends of the tubular shaft 28, the end members being secured in position by means of the set screws 30.

Bores 30' are formed in the end members 29, and establish communication between the interior of the tubular blower shaft and the atmosphere. The bores 30 are disposed at oblique angles with respect to the shaft on which the blower is mounted, so that as the shaft rotates, the openings will pick up air, and create a draft through the tubular shaft 28, maintaining the shaft cool at all times.

The blower blades are indicated by the reference character 3| and are secured to the tubular shaft 28, by means of rivets 32.

The ends of the tubular blower shaft are mounted in openings formed in the blower housing, the entire shaft assembly being held against end thrust by means of the bracket 35' that is secured to the blower housing. This bracket 3| is formed with an opening in which one end of the hollow motor shaft rotates, spaced nuts 36' being mounted on the motor shaft at opposite sides of the bracket, to allow free rotary movement of the shaft and blower supported thereby but eliminate end thrust.

A bracket indicated at 33 is supported by the wall of the blower housing 23 and provides a support for the motor 34 that is connected with a suitable source of electricity supply not shown.

From the foregoing it will be seen that we have provided a blower which may be readily and easily connected with a smoke-pipe to create a forced draft through the smoke-pipe and consequently control the heat of the stove or furnace, with which the stove-pipe is connected.

It will further be seen that during the operation of the device, air will be drawn through the hollow tubular shaft 28, maintaining the shaft cool and preventing overheating of the shaft due to the direct contact of the products of combustion, with the shaft.

What is claimed is:

1. In a rotary blower, comprising a hollow motor shaft, a tubular shaft encasing the hollow motor shaft, end members secured within the ends of the tubular shaft and being secured to the hollow motor shaft, said end members having openings establishing communication. with the space between the shafts, and the atmosphere, whereby air is circulated between the shafts, cooling the shafts, when the shafts are rotated.

2. In a rotary blower, comprising a hollow motor shaft, a tubular shaft encasing the hollow motor shaft and disposed in spaced relation therewith, end members secured within the ends of the tubular shaft and secured to the hollow motor shaft, said end members having openings disposed at oblique angles with respect to the side faces of the end members, said openings establishing communication with the space between the shafts and the atmosphere, whereby air is circulated between the shafts, cooling the shafts as the shafts are rotated.

ROGER J. DEVER. PATRICK J. DEVER. 

